Piezoelectric generator with dual-crystal torsion beam unit

Abstract

The present invention discloses a piezoelectric generator with a dual-crystal torsion beam unit, which includes a generator base, and a rotor assembly and a torsion vibration assembly arranged on the generator base; the rotor assembly includes a rotating shaft with a bearing arranged on the central axis of the generator base, and a rotating disk coaxially fixedly mounted on the rotating shaft, and a plurality of excitation teeth are evenly distributed on the outer edge of the rotating disk; the torsion vibration assembly includes a plurality of dual-crystal torsion vibration beams arranged circumferentially on the generator base with the rotating shaft as the central axis, and a piezoelectric sheet is arranged on each dual-crystal torsion vibration beam; and one end of the dual-crystal torsion vibration beam is fixedly arranged, and the other free end part extends into the tooth groove between two adjacent excitation teeth. Therefore, when the rotating shaft drives the rotating disk to rotate, the excitation tooth drives the dual-crystal torsion vibration beam to torsionally vibrate through the undulating free end, and then the piezoelectric sheet arranged on the dual-crystal torsion vibration beam undergoes torsion shear deformation under the torsional elastic shearing action of the dual-crystal torsion vibration beam, thereby generating current.

Description

Technical Field

[0001] The invention relates to a generator, in particular to a double-crystal torsion beam unit piezoelectric generator. Background Art

[0002] Today, with the increasing shortage of energy, the growing demand for energy and the increasing attention to environmental protection in countries around the world, finding a lasting and clean energy has become the focus of research in various countries. With the continuous development of science and technology, a variety of different energy harvesting technologies have been gradually developed in recent years to convert energy in the environment into electrical energy. The most common ones are photoelectric conversion and mechanical conversion. Photoelectric conversion can convert light energy into electrical energy, but it is greatly restricted by environmental conditions, while mechanical conversion has relatively small requirements for the environment, and it can use wind energy, water energy, etc. At present, the conversion of mechanical energy into electrical energy is mainly electromagnetic conversion, electrostatic conversion and piezoelectric conversion. Electromagnetic conversion technology is mature. Almost all hydropower generation, wind power, and thermal power generation in the existing technology are realized by electromagnetic conversion, but its structure is complex, the volume is large, and it is easy to generate electromagnetic interference. The electrostatic conversion voltage is low and requires an independent power initialization process. Piezoelectric conversion does not have the above problems. It has a simple structure, no electromagnetic interference, high conversion voltage, and no transformer. Piezoelectric conversion technology has gradually become a research hotspot.

[0003] However, the excitation method of the piezoelectric power generation device in the prior art is relatively simple, which leads to low electromechanical conversion efficiency, which is not conducive to improving the power generation capacity. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a double-crystal torsion beam unit piezoelectric generator, which has higher power generation efficiency.

[0005] In order to solve the above technical problems, the present invention provides a dual-crystal torsional vibration beam unit piezoelectric generator, which includes a generator base, and a rotor assembly and a torsional vibration assembly arranged on the generator base;

[0006] The rotor assembly comprises a rotating shaft with a bearing arranged on the central axis of the generator base, and a rotating disk coaxially fixedly sleeved on the rotating shaft, wherein a plurality of excitation teeth are evenly distributed in the circumferential direction on the outer edge of the rotating disk;

[0007] The torsional vibration assembly includes a plurality of dual-crystal torsional vibration beams circumferentially arranged on a generator base with a rotating shaft as the central axis, each of the dual-crystal torsional vibration beams is provided with a piezoelectric sheet; and one end of the dual-crystal torsional vibration beam is fixedly arranged, and the other free end partially extends into the tooth groove between two adjacent excitation teeth.

[0008] Preferably, the rotating shaft is also provided with a bearing sleeve with a limit plate, the limit plate is fixedly arranged relative to the generator base, one end of the dual crystal torsion vibration beam is fixedly arranged on the generator base, and the other free end passes through the limit plate and is set with the limit plate bearing.

[0009] Preferably, the limit plate has a plurality of limit holes distributed circumferentially relative to the bi-crystal torsion vibration beam, each of the limit holes is provided with a limit bearing, and the bi-crystal torsion vibration beam is provided with a rotating part at a height position relative to the limit plate, and the rotating part is fixedly clamped in the inner ring of the limit bearing.

[0010] Preferably, both end corners of the free end of the bimorph torsion beam extending to one side of the tooth groove of the adjacent excitation tooth are rounded.

[0011] Preferably, the bimorph torsional vibration beam is a rectangular rod body vertically arranged on the generator base, and the length direction of the rectangular projection of the rectangular rod body relative to the generator base is consistent with the radial direction of the turntable.

[0012] Preferably, the piezoelectric sheet is arranged on one side or two opposite sides in the length direction of the rectangular projection of the bimorph torsion beam relative to the generator base.

[0013] Preferably, the number of the excitation teeth on the outer edge of the turntable is an integer multiple of the number of the dual-crystal torsional vibration beams distributed circumferentially on the generator base.

[0014] Preferably, a motor sleeve is sheathed on the outer side of the torsional vibration assembly, the motor sleeve is coaxially arranged with the rotating shaft, and the outer edges of the generator base and the limiting plate are fixedly connected to the inner wall of the motor sleeve.

[0015] Preferably, a heat dissipation cover plate is fixedly provided at the other end of the motor set relative to the generator base, and the center of the heat dissipation cover plate is arranged with the shaft bearing, and a plurality of heat dissipation windows are circumferentially arranged on the heat dissipation cover plate with the shaft as the center.

[0016] The bi-crystal torsional vibration beam unit piezoelectric generator of the present invention is provided with a piezoelectric sheet on the bi-crystal torsional vibration beam, and a free end portion of the bi-crystal torsional vibration beam is provided to extend into the tooth groove between two adjacent excitation teeth, so that when the rotating shaft drives the turntable to rotate, the excitation tooth drives the rectangular rod body of the bi-crystal torsional vibration beam to torsional vibration through the waving free end, so that the piezoelectric sheet provided on the bi-crystal torsional vibration beam undergoes gradually increasing torsional vibration shear deformation under the torsional elastic shearing action of the bi-crystal torsional vibration beam, thereby generating current, and it can respectively excite multiple bi-crystal torsional vibration beams to generate torsional deformation through multiple excitation teeth of the turntable, thereby improving the electromechanical conversion efficiency; and when the excitation tooth rotates past the free end, the bi-crystal torsional vibration beam releases the shearing action on the piezoelectric sheet, and the torsional shear deformation on the piezoelectric sheet gradually disappears, thereby generating current again, so that the safe and reliable electric energy generated can be used for wind power generation or for household use or for charging various toys, mobile phones, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the double-crystal torsion beam unit piezoelectric generator of the present invention;

[0018] Figure 2 is an exploded view of the double-crystal torsion beam unit piezoelectric generator of the present invention;

[0019] Figure 3 yes Figure 2 The enlarged schematic diagram of the middle A part;

[0020] Figure 4 It is a schematic diagram of the structure of the piezoelectric generator of the double-crystal torsion beam unit after the shell is stripped off;

[0021] Figure 5 yes Figure 4 The enlarged schematic diagram of the middle part B;

[0022] Figure 6 Schematic diagram of the structure of the twin-crystal torsion beam. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The present invention provides a dual-crystal torsion beam 4-unit piezoelectric generator, such as Figure 1 and Figure 2 As shown, it includes a generator base 1, and a rotor assembly and a torsional vibration assembly arranged on the generator base 1, wherein the rotor assembly includes a rotating shaft 2 with a bearing arranged on the central axis of the generator base 1, and a rotating disk 3 coaxially fixedly sleeved on the rotating shaft 2; Figure 3As shown, a plurality of excitation teeth 31 are evenly distributed around the outer edge of the rotating disk 3 , and the rotating shaft 2 can rotate relative to the generator base 1 and synchronously drive the rotating disk 3 to rotate, so that the excitation teeth 31 rotate clockwise or counterclockwise.

[0025] The torsional vibration assembly includes a plurality of dual-crystal torsional vibration beams 4 circumferentially arranged on the generator base 1 with the rotating shaft 2 as the central axis, and each of the dual-crystal torsional vibration beams 4 is provided with a piezoelectric sheet 5, such as Figure 5 As shown, one end of the bimorph torsional vibration beam 4 is fixedly arranged on the generator base 1, and the other free end part extends into the tooth groove between two adjacent excitation teeth 31. When the rotating shaft 2 drives the rotating disk 3 to rotate, the excitation teeth 31 on the rotating disk 3 will cause the bimorph torsional vibration beam 4 to torsional vibration. Figure 4 and Figure 6 As shown, the bi-crystal torsional vibration beam 4 is a rectangular rod body extending perpendicularly to the generator base 1, and the rectangular rod body is made of materials such as aluminum alloy or stainless steel, and the length direction of the rectangular projection relative to the generator base 1 is consistent with the radial direction of the turntable 3, so that the excitation tooth 31 can fluctuate the rectangular rod body of the bi-crystal torsional vibration beam 4 to the maximum extent, and the piezoelectric piece 5 is arranged on one side or two opposite sides of the length direction of the rectangular projection, so that the piezoelectric piece 5 also produces the maximum torsional vibration shear deformation when the excitation tooth 31 fluctuates the bi-crystal torsional vibration beam 4.

[0026] The shaft 2 is also provided with a bearing sleeve with a limit plate 6, the limit plate 6 is fixedly arranged relative to the generator base 1, the main body extension direction of the double crystal torsion beam 4 is arranged parallel to the main body extension direction of the shaft 2, one end of the double crystal torsion beam 4 is fixedly arranged on the generator base 1, and the other free end passes through the limit plate 6 and is arranged with the limit plate 6 bearing sleeve, such as Figure 2 As shown, the limit plate 6 has a plurality of limit holes 61 distributed circumferentially relative to the bi-crystal torsional vibration beam 4, and the limit holes 61 are each provided with a limit bearing. The bi-crystal torsional vibration beam 4 is provided with a rotating portion 41 at a height position relative to the limit plate 6, and the bi-crystal torsional vibration beam 4 is fixedly clamped in the inner ring of the limit bearing by the rotating portion 41, so that the bi-crystal torsional vibration beam 4 can only undergo angular displacement, and is restricted from undergoing linear displacement.

[0027] like Figures 4 to 6 As shown, the free end of the dual crystal torsion beam 4 passing through the limit plate 6 is the excitation portion 42, and the excitation portion 42 partially extends into the tooth groove between two adjacent excitation teeth 31. The number of excitation teeth 31 on the outer edge of the rotating disk 3 is an integral multiple of the number of excitation portions 42. At the same time, in order to ensure that the excitation applied to the excitation portion 42 by the rotating disk 3 changes smoothly, the two end corners of the side extending from the free end to the tooth groove of the adjacent excitation tooth 31 are set to be rounded, so that the excitation tooth 31 can smoothly fluctuate the excitation portion 42.

[0028] When the rotating shaft 2 drives the turntable 3 to rotate, the excitation tooth 31 drives the rectangular rod body of the bi-crystal torsion vibration beam 4 to torsional vibration through the wave excitation part 42, so that the piezoelectric film 5 arranged on the bi-crystal torsion vibration beam 4 undergoes a gradually increasing torsional shear deformation under the torsional elastic shear action of the bi-crystal torsion vibration beam 4, thereby generating current; when the excitation tooth 31 rotates past the excitation part 42, the bi-crystal torsion vibration beam 4 quickly returns to its initial state under the action of the restoring elastic force of the body, and during the recovery process, the bi-crystal torsion vibration beam 4 gradually releases the shear action on the piezoelectric film 5, and the torsional shear deformation of the piezoelectric film 5 gradually disappears, thereby generating current again.

[0029] Furthermore, a motor sleeve 7 is wrapped around the outside of the torsional vibration assembly, and the motor sleeve 7 is coaxially arranged with the rotating shaft 2. The outer edges of the generator base 1 and the limit plate 6 are fixedly connected to the inner wall of the motor sleeve 7; a heat dissipation cover plate 8 is fixedly provided at the other end of the motor sleeve relative to the generator base 1, and the center is arranged at the bearing of the rotating shaft 2, and a plurality of heat dissipation windows 81 are circumferentially arranged on the heat dissipation cover plate with the rotating shaft 2 as the center.

[0030] The bi-crystal torsional vibration beam 4 unit piezoelectric generator described in the present invention is provided with a piezoelectric sheet 5 on the bi-crystal torsional vibration beam 4, and the excitation portion 42 of the bi-crystal torsional vibration beam 4 is partially extended into the tooth groove between two adjacent excitation teeth 31, so that when the rotating shaft 2 drives the turntable 3 to rotate, the excitation tooth 31 drives the rectangular rod body of the bi-crystal torsional vibration beam 4 to torsional vibration through the wave excitation portion 42, and then the piezoelectric sheet 5 provided on the bi-crystal torsional vibration beam 4 is subjected to the torsional elastic shearing action of the bi-crystal torsional vibration beam 4, and gradually increases the torsional vibration shear deformation, thereby generating current; and when the excitation tooth 31 rotates past the excitation portion 42, the bi-crystal torsional vibration beam 4 releases the shearing action on the piezoelectric sheet 5, and the torsional shear deformation on the piezoelectric sheet 5 gradually disappears, thereby generating current again.

[0031] The dual-crystal torsion beam 4-unit piezoelectric generator described in the present invention can be used for wind power generation and can also be used for household use or for charging various toys, mobile phones, etc. When used for wind power generation, the rotating shaft 2 is connected to the wind turbine blade rotating shaft for power transmission to drive the rotating shaft 2 to rotate and generate electricity. When used for household use or for charging various toys, mobile phones, etc., an external crank handle can be connected to the rotating shaft 2 to manually rotate the rotating shaft 2 to generate electricity.

[0032] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A double-crystal torsion beam unit piezoelectric generator, characterized in that: It includes a generator base, and a rotor assembly and a torsional vibration assembly arranged on the generator base; The rotor assembly comprises a rotating shaft with a bearing arranged on the central axis of the generator base, and a rotating disk coaxially fixedly sleeved on the rotating shaft, wherein a plurality of excitation teeth are evenly distributed in the circumferential direction on the outer edge of the rotating disk; The torsional vibration assembly includes a plurality of dual-crystal torsional vibration beams circumferentially arranged on the generator base with the rotating shaft as the central axis, each of the dual-crystal torsional vibration beams is provided with a piezoelectric sheet; and one end of the dual-crystal torsional vibration beam is fixedly arranged, and the other free end portion extends into the tooth groove between two adjacent excitation teeth; The shaft is also provided with a bearing sleeve with a limit plate, the limit plate is fixedly arranged relative to the generator base, one end of the dual crystal torsion beam is fixedly arranged on the generator base, and the other free end passes through the limit plate and is arranged with the limit plate bearing set; The limiting plate has a plurality of limiting holes distributed circumferentially relative to the double crystal torsion vibration beam, and the limiting holes are all provided with limiting bearings. The double crystal torsion vibration beam is provided with a rotating part at a height position relative to the limiting plate, and the rotating part is fixedly sleeved in the inner ring of the limiting bearing; The dual crystal torsional vibration beam is a rectangular rod body vertically arranged on the generator base, and the length direction of the rectangular projection of the rectangular rod body relative to the generator base is consistent with the radial direction of the rotating disk.

2. The double-crystal torsional beam unit piezoelectric generator according to claim 1, characterized in that: The free end of the dual-crystal torsion beam extends to one side of the tooth groove of the adjacent excitation tooth, and both end corners are rounded.

3. The double-crystal torsional beam unit piezoelectric generator according to claim 1, characterized in that: The piezoelectric sheet is arranged on one side or two opposite sides of the length direction of the rectangular projection of the bimorph torsion beam relative to the generator base.

4. The double-crystal torsional beam unit piezoelectric generator according to claim 1, characterized in that: The number of the excitation teeth on the outer edge of the turntable is an integral multiple of the number of the dual-crystal torsional vibration beams distributed circumferentially on the generator base.

5. The double-crystal torsional beam unit piezoelectric generator according to claim 1, characterized in that: A motor sleeve is sheathed on the outer side of the torsional vibration component. The motor sleeve is coaxially arranged with the rotating shaft. The outer edges of the generator base and the limiting plate are fixedly connected to the inner wall of the motor sleeve.

6. The double-crystal torsion beam unit piezoelectric generator according to claim 5, characterized in that: A heat dissipation cover plate whose center is arranged with the bearing of the rotating shaft is fixedly provided on the other end of the motor sleeve relative to the generator base, and a plurality of heat dissipation windows are circumferentially arranged on the heat dissipation cover plate with the rotating shaft as the center.

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